Rash, Age 12 and Older-Prevention If you have a known allergy, avoid contact with the substance that causes the allergy.

Avoid all infectious diseases that cause skin rashes, such as chickenpox, measles, and some types of sexually transmitted infections (STIs).

Treat your skin gently:

• Do not bathe too much. Soap and water dries your skin of the essential oils that hold in moisture.
• Do not scratch your skin or rub it roughly with towels.
• Avoid exposure to chemicals that may irritate the skin, such as rubbing alcohol, soaps, detergents, or solvents.